[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] callout from interp.c code to objc/swift code need autorelease pool (#374)

[maenu]

Instead of the PR #373, maybe we should solve this issue. Below is the trace to the leak in #373, `ioProcessEvents` seems like an appropriate place for the autoreleasepool. How can we find other places that enter Objective-C and need a pool?

```
Direct leak of 219512 byte(s) in 1193 object(s) allocated from:
    #0 0x10bb1fffc in __sanitizer_mz_malloc (libclang_rt.asan_osx_dynamic.dylib:x86_64h+0x5dffc)
    #1 0x7fffdd224281 in malloc_zone_malloc (libsystem_malloc.dylib:x86_64+0x2281)
    #2 0x7fffc6de33d5 in AllocateAndInitializeEvent(__CFAllocator const*) (HIToolbox:x86_64+0x33d5)
    #3 0x7fffc6e3fc4d in CopyEventInternal(__CFAllocator const*, OpaqueEventRef*) (HIToolbox:x86_64+0x5fc4d)
    #4 0x7fffc6e49228 in CopyEventAs (HIToolbox:x86_64+0x69228)
    #5 0x7fffc6e1d349 in CreateEventWithCGEvent (HIToolbox:x86_64+0x3d349)
    #6 0x7fffc6e1b0e2 in CreateAndPostEventWithCGEvent(__CGEvent*, unsigned int, unsigned char, __CFMachPortBoost*) (HIToolbox:x86_64+0x3b0e2)
    #7 0x7fffc6e275cd in Convert1CGEvent(unsigned char) (HIToolbox:x86_64+0x475cd)
    #8 0x7fffc6e2745e in MainLoopObserver(unsigned int, OpaqueEventRef*, void*) (HIToolbox:x86_64+0x4745e)
    #9 0x7fffc6de8368 in _NotifyEventLoopObservers (HIToolbox:x86_64+0x8368)
    #10 0x7fffc6e10ea5 in RunCurrentEventLoopInMode (HIToolbox:x86_64+0x30ea5)
    #11 0x7fffc6e10bf8 in ReceiveNextEventCommon (HIToolbox:x86_64+0x30bf8)
    #12 0x7fffc6e10b25 in _BlockUntilNextEventMatchingListInModeWithFilter (HIToolbox:x86_64+0x30b25)
    #13 0x7fffc53a5a53 in _DPSNextEvent (AppKit:x86_64+0x46a53)
    #14 0x7fffc5b217ed in -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (AppKit:x86_64+0x7c27ed)
    #15 0x10b7ce07c in -[sqSqueakOSXApplication(events) pumpRunLoopEventSendAndSignal:] sqSqueakOSXApplication+events.m:78
    #16 0x10b7ce7d9 in -[sqSqueakOSXApplication(events) pumpRunLoop] sqSqueakOSXApplication+events.m:105
    #17 0x10b7e4898 in vmIOProcessEvents sqSqueakEventsAPI.m:80
    #18 0x10b7e49c7 in ioProcessEvents sqSqueakEventsAPI.m:103
    #19 0x10b5b5653 in checkForEventsMayContextSwitch gcc3x-cointerp.c:62680
    #20 0x10b5c17ed in ceCheckForInterrupts gcc3x-cointerp.c:15188
    #21 0x119a75794  (<unknown module>)
    #22 0x10b566712 in interpret gcc3x-cointerp.c:2754
    #23 0x10b7ebada in -[sqSqueakMainApplication runSqueak] sqSqueakMainApplication.m:201
    #24 0x7fffc93786fc in __NSFirePerformWithOrder (Foundation:x86_64+0xd76fc)
    #25 0x7fffc78cfc56 in __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ (CoreFoundation:x86_64h+0xa6c56)
    #26 0x7fffc78cfbc6 in __CFRunLoopDoObservers (CoreFoundation:x86_64h+0xa6bc6)
    #27 0x7fffc78b05f8 in __CFRunLoopRun (CoreFoundation:x86_64h+0x875f8)
    #28 0x7fffc78b0033 in CFRunLoopRunSpecific (CoreFoundation:x86_64h+0x87033)
    #29 0x7fffc6e10ebb in RunCurrentEventLoopInMode (HIToolbox:x86_64+0x30ebb)
```

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